Exhibit 21

SUBSIDIARIES OF

POTASH CORPORATION OF SASKATCHEWAN INC.



|                                              |  |                                         
|--------------------------------------------- |  | ----------------------------------------
|Name of Entity                                |  | Jurisdiction ofIncorporation orFormation
|101070338 Saskatchewan Ltd.                   |  | Saskatchewan                            
|175360 Canada Inc.                            |  | Canada                                  
|628550 Saskatchewan Ltd.                      |  | Saskatchewan                            
|4420 Investment LLC                           |  | Delaware                                
|AA Sulfuric Corporation                       |  | Louisiana                               
|Canpotex Bulk Terminals Limited               |  | Canada                                  
|Chilkap Resources Ltd.                        |  | Yukon                                   
|Inversiones El Boldo Limitada                 |  | Chile                                   
|Inversiones El Coigüe S.A.                    |  | Chile                                   
|Inversiones El Roble Limitada                 |  | Chile                                   
|Inversiones El Sauce Limitada                 |  | Chile                                   
|Inversiones PCS Chile S.A.                    |  | Chile                                   
|Inversiones RAC Chile Limitada                |  | Chile                                   
|Minera Saskatchewan Limitada                  |  | Chile                                   
|PCS Administration (USA), Inc.                |  | Delaware                                
|PCS (Barbados) Holdings SRL                   |  | Barbados                                
|PCS (Barbados) Investment Company Ltd.        |  | Barbados                                
|PCS (Barbados) Shipping, Ltd.                 |  | Barbados                                
|PCS Cassidy Lake Company                      |  | Ontario                                 
|PCS Cassidy Lake Limited                      |  | Canada                                  
|PCS Chile I LLC                               |  | Delaware                                
|PCS Chile II LLC                              |  | Delaware                                
|PCS Fosfatos do Brasil Ltda.                  |  | Brazil                                  
|PCS Hammond LLC                               |  | Delaware                                
|PCS Hungary Holding Limited Liability Company |  | Hungary                                 
|PCS Industrial Products Inc.                  |  | Delaware                                
|PCS Joint Venture, Ltd.                       |  | Florida                                 
|PCS Jordan LLC                                |  | Delaware                                
|PCS L.P. Inc.                                 |  | Delaware                                
|PCS LP LLC 2                                  |  | Delaware                                
|PCS Nitrogen Ammonia Terminal Corporation I   |  | Texas                                   
|PCS Nitrogen Ammonia Terminal Corporation II  |  | Delaware                                
|PCS Nitrogen Delaware LLC                     |  | Delaware                                
|PCS Nitrogen Fertilizer, L.P.                 |  | Delaware                                
|PCS Nitrogen Fertilizer Operations, Inc.      |  | Delaware                                
|PCS Nitrogen, Inc.                            |  | Delaware                                
|PCS Nitrogen LCD Corporation                  |  | Delaware                                
|PCS Nitrogen Ohio, L.P.                       |  | Delaware                                
|PCS Nitrogen Trinidad Corporation             |  | Delaware                                
|PCS Nitrogen Trinidad Limited                 |  | Trinidad                                
|PCS Phosphate Company, Inc.                   |  | Delaware                                
|PCS Purified Phosphates                       |  | Virginia                                
|PCS Sales (Canada) Inc.                       |  | Saskatchewan                            
|PCS Sales (Indiana), Inc.                     |  | Indiana                                 



---

|                                                     |  |                                         
|---------------------------------------------------- |  | ----------------------------------------
|Name of Entity                                       |  | Jurisdiction ofIncorporation orFormation
|PCS Sales (Iowa), Inc.                               |  | Iowa                                    
|PCS Sales (USA), Inc.                                |  | Delaware                                
|PCS USA LLC                                          |  | Delaware                                
|Pérola S.A.                                          |  | Brazil                                  
|Phosphate Holding Company, Inc.                      |  | Delaware                                
|Potash Corporation of Saskatchewan (Florida) Inc.    |  | Florida                                 
|Potash Corporation of Saskatchewan Transport Limited |  | Saskatchewan                            
|PotashCorp Agricultural Cooperative Society Ltd.     |  | Israel                                  
|PotashCorp Finance (Barbados) Limited                |  | Barbados                                
|Potash Holding Company, Inc.                         |  | Delaware                                
|RAC Investments Ltd.                                 |  | Cayman                                  
|White Springs Agricultural Chemicals, Inc.           |  | Delaware